520540243 has 4 divisors (see below), whose sum is σ = 527129440. Its totient is φ = 513951048.

The previous prime is 520540217. The next prime is 520540247. The reversal of 520540243 is 342045025.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 520540243 - 2²¹ = 518443091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520540247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3294480 + ... + 3294637.

It is an arithmetic number, because the mean of its divisors is an integer number (131782360).

Almost surely, 2^520540243 is an apocalyptic number.

520540243 is a deficient number, since it is larger than the sum of its proper divisors (6589197).

520540243 is an equidigital number, since it uses as much as digits as its factorization.

520540243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6589196.

The product of its (nonzero) digits is 4800, while the sum is 25.

The square root of 520540243 is about 22815.3510382812. The cubic root of 520540243 is about 804.4235385302.

Adding to 520540243 its reverse (342045025), we get a palindrome (862585268).

The spelling of 520540243 in words is "five hundred twenty million, five hundred forty thousand, two hundred forty-three".